Just tested out on my player rk2608. Yes it works, this is awesome work!
The volume seemed to be full on, couldn't see the option to lower it yet, and the signal to noise ratio seemed a bit low, quite high background noise on my player, but maybe there is a way somehow to alter this to suit the individual player.
btw the rk2706 players don't support rkp format at all, pity as it's a useful (and low risk) platform to test and experiment with.
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